Four boy have the same biological mother and father what percentage of each boys chromosomes come from the mother

The four boys should inherit X chromosome from their mother while the Y comes from their father. However, the X chromosomes typically have more genes than Y chromosomes. So, even if the mother or father equally contributes one X and one Y respectively, one is dominant over the other. In this case, it’s the X chromosomes — therefore, males have a fraction more of their mother’s traits.

Dis the correct answer thats what i put and it was right 

It is called the medulla oblongata or people usually call it medulla. it is the lower half of the brain stem continuous with the spinal cord.